refactor: Cache feed data for purchase form and observe Feed model changes

app/Filament/Resources/Manage/FeedPurchases/Schemas/FeedPurchaseForm.php

@@ -11,19 +11,26 @@
 use Filament\Schemas\Components\Section;
 use Filament\Schemas\Components\View;
 use Filament\Schemas\Schema;
+use Illuminate\Support\Facades\Cache;
 
 class FeedPurchaseForm
 {
     public static function configure(Schema $schema): Schema
     {
-        $feeds = Feed::with('unit')
-            ->latest()
-            ->get()
-            ->map(function ($feed) {
-                $feed->image = $feed->getFirstMediaUrl('feeds');
+        $feeds = Cache::store('redis')->remember(
+            'feeds_with_unit_for_purchase_form',
+            now()->addMonth(),
+            function () {
+                return Feed::with('unit')
+                    ->latest()
+                    ->get()
+                    ->map(function ($feed) {
+                        $feed->image = $feed->getFirstMediaUrl('feeds');
 
-                return $feed;
-            });
+                        return $feed;
+                    });
+            }
+        );
 
         $cartItems = FeedPurchaseItem::with('feed')
             ->whereNull('feed_purchase_id')

app/Models/Feed.php

@@ -2,6 +2,8 @@
 
 namespace App\Models;
 
+use App\Observers\FeedObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
 use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
@@ -11,6 +13,7 @@
 use Spatie\MediaLibrary\HasMedia;
 use Spatie\MediaLibrary\InteractsWithMedia;
 
+#[ObservedBy([FeedObserver::class])]
 class Feed extends Model implements HasMedia
 {
     use HasFactory, InteractsWithMedia, SoftDeletes;

app/Observers/FeedObserver.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Feed;
+use Illuminate\Support\Facades\Cache;
+
+class FeedObserver
+{
+    /**
+     * Handle events after any change that should invalidate feed cache.
+     */
+    protected function clearFeedCache(): void
+    {
+        Cache::store('redis')->forget('feeds_with_unit_for_purchase_form');
+    }
+
+    /**
+     * Handle the Feed "created" event.
+     */
+    public function created(Feed $feed): void
+    {
+        $this->clearFeedCache();
+    }
+
+    /**
+     * Handle the Feed "updated" event.
+     */
+    public function updated(Feed $feed): void
+    {
+        $this->clearFeedCache();
+    }
+
+    /**
+     * Handle the Feed "deleted" event.
+     */
+    public function deleted(Feed $feed): void
+    {
+        $this->clearFeedCache();
+    }
+
+    /**
+     * Handle the Feed "restored" event.
+     */
+    public function restored(Feed $feed): void
+    {
+        $this->clearFeedCache();
+    }
+
+    /**
+     * Handle the Feed "force deleted" event.
+     */
+    public function forceDeleted(Feed $feed): void
+    {
+        $this->clearFeedCache();
+    }
+}